CN1171790C - Small-grain Y-type zeolite and its preparing process - Google Patents
Small-grain Y-type zeolite and its preparing process Download PDFInfo
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Abstract
The present invention relates to a Y-shaped zeolite with fine crystal grains, wherein the cell constant of the zeolite rages from 24.25 to 24.5 angstrom, and the crystallization retention level is at least 75%. The zeolite has the advantages of high hydrothermal stability, activity and the stability of activity.
Description
The invention relates to a kind of y-type zeolite and preparation method thereof, more particularly, is about a kind of small-grain Y-type zeolite and preparation method thereof.
Y-type zeolite has been widely used as the activity of such catalysts component of various catalyzed reactions, though its aperture is bigger, yet result of study shows that critical diameter all can not be diffused into the inside, duct of y-type zeolite greater than the macromole of 1.02 nanometers.With the cracking reaction is example, and for these macromole, the cracking activity center only is present in the outside surface of y-type zeolite.In recent years, the catalytic cracking reaction raw material is more and more heavier, slag-mixing amount increases year by year, macromole content is more and more higher in the reaction raw materials, and only account for about 3% of its total surface as the outside surface of the y-type zeolite of cracking catalyst main active component, obviously, the more and more higher macromolecular cpd of content in the low not competent cracking stock oil of outside surface like this.
Studies show that small-grain Y-type zeolite has the big much bigger outside surface of grain Y-type zeolite, is applicable to containing the catalytic cracking of higher heavy oil of macromolecular cpd and residual oil, has a good application prospect.Yet, the silica alumina ratio of the small-grain Y-type zeolite that prior art is synthesized is all lower, lattice constant is big (generally greater than 24.5 dusts) all, because the heat and the hydrothermal stability of the small-grain Y-type zeolite that such lattice constant is bigger are all relatively poor, the therefore non-constant of its activity stability in the real reaction process.
With the y-type zeolite super stabilizing is the effective ways that improve y-type zeolite heat and hydrothermal stability.
C.V.Dvid and P.K.Maher (Zeolite Chemistry and Catalysis, ACSMonograph 171, P285-331, Washington D.C., 1976) a kind of hydrothermal dealumination method has been proposed, this method comprises the aqueous solution exchange that contains ammonium ion of NaY zeolite, then, under 600-825 ℃ temperature, with zeolite roasting under water vapour atmosphere, repeated multiple times obtains overstable gamma zeolite.Method is simple for this, but have the room that stays behind a large amount of dealuminzations in the overstable gamma zeolite skeleton of preparation in this way, and zeolite framework jumps easily and collapses, and therefore, the degree of crystallinity of the overstable gamma zeolite that obtains is very low.
US4503023 discloses a kind of with SiO
4Tetrahedral form is inserted method in the Si-Al zeolite lattice with silicon, and this method comprises silica alumina ratio (SiO
2/ Al
2O
3Mol ratio) the crystalline zeolite silico-aluminate that be at least 3, bore dia is at least 3 dusts contacts with a kind of silicofluoride, the consumption of silicofluoride is that per 100 gram Zeolite silicates use 0.0075 mole of silicofluoride, described silicofluoride is that the aqueous solution form of 3-7 exists with pH, and with contacting of zeolite aluminosilicate should be enough slow, to keep at least 60% of initial zeolite aluminosilicate degree of crystallinity.The skeleton room is less in the overstable gamma zeolite of this method preparation, and product degree of crystallinity is higher, still, only is applicable to the outside dealuminzation of zeolite, and when dealumination depth was higher, promptly the y-type zeolite dealuminzation was to lattice constant during less than 24.50 dusts, and obvious decline also takes place degree of crystallinity.
US4701313 discloses a kind of method that contains aluminium Silicon-rich zeolite of producing of controlling, this method comprises that preparation a kind of aluminium and boron content are all greater than 0 boracic Beta zeolite, handle this zeolite with silicon tetrachloride, the temperature and time of handling is enough to silicon replacement boron wherein, and, reclaim boron content and reduce and the constant Silicon-rich zeolite of aluminium content.
US5,023,066 discloses a kind of method that replaces aluminium atom in the faujusite lattice with Siliciumatom, be included under 80-150 ℃ the temperature, with a kind of activatory octahedral crystalline zeolite and the reaction of a kind of halogenated silane, and the product that obtains of washing, washing wherein is earlier with the liquid scrubbing of non-water basically, wash with water again.
Above-mentioned two kinds of methods are applicable to boracic Beta zeolite and the average crystal grain diameter super stabilizing greater than 1 micron big grain Y-type zeolite respectively, and with aforesaid method to average crystal grain diameter less than 1 micron, particularly average crystal grain diameter is that the little crystal grain zeolite of 0.1-0.8 micron carries out super stabilizing when handling, because the distinctive unstable of small-grain Y-type zeolite, the degree of crystallinity of the little crystal grain overstable gamma zeolite that obtains is still lower.
Result of study shows, the small-grain Y-type zeolite that prior art synthesizes all is not an overstable gamma zeolite, its lattice constant is all greater than 24.5 dusts, and adopt above-mentioned existing super stabilizing method that small-grain Y-type zeolite is carried out super stabilizing, though the lattice constant of small-grain Y-type zeolite is reduced to below 24.5 dusts, the crystallization reservation degree (with respect to original small-grain Y-type zeolite) of the little crystal grain overstable gamma zeolite that obtains all is lower than 75%.
The purpose of this invention is to provide a kind of small-grain Y-type zeolite, another object of the present invention provides this prepare zeolite method.
Small-grain Y-type zeolite provided by the invention is a kind of little crystal grain overstable gamma zeolite, and the lattice constant of this zeolite is the 24.25-24.5 dust, and crystallization reservation degree is at least 75%.
The preparation method of small-grain Y-type zeolite provided by the invention comprises that the dry gas that will contain silicon tetrachloride contacts with a kind of raw material y-type zeolite, the product that washing obtains, wherein, described raw material y-type zeolite is that a kind of lattice constant is the small-grain Y-type zeolite that 24.5 dust to 24.7 dust water-contents are not more than 10 heavy %, water-content in the described dry gas that contains silicon tetrachloride is not higher than 1000 micrograms water/gram gas, the contact temperature is 160-300 ℃, be 20 minutes to 10 hours duration of contact, the weight ratio of silicon tetrachloride and zeolite is 0.1-0.8, and described lattice constant is that preparation method that 24.5 dust to 24.7 dust water-contents are not more than the small-grain Y-type zeolite of 10 heavy % comprises that the lattice constant that water-content is higher than 10 heavy % is the small-grain Y-type zeolite of 24.5 dust to 24.7 a dusts drying at least 0.5 hour under 150-350 ℃ temperature.
In the present invention, " little crystal grain " in the described small-grain Y-type zeolite refers to the little crystal grain of this area general reference, be average particulate diameter less than 1 micron crystal grain, be meant that especially average particulate diameter is that 0.1-0.8 micron, especially average particulate diameter are the crystal grain of 0.1-0.5 micron.
Small-grain Y-type zeolite provided by the invention is a kind of little crystal grain overstable gamma zeolite, and its lattice constant is the 24.25-24.5 dust, is preferably the 24.3-24.5 dust.The crystallization reservation degree of described zeolite is at least 75%, preferably is at least 80%, more preferably 80-95%.The lattice constant that crystallization reservation degree described here refers to be higher than with respect to water-content 10 heavy % is the degree of crystallinity of the small-grain Y-type zeolite of 24.5 dust to 24.7 dusts.The lattice constant that water-content is higher than 10 heavy % is that the degree of crystallinity of the small-grain Y-type zeolite of 24.5 dusts to 2,4.7 dusts is decided to be 100%, and the peak area that the crystallization reservation degree of small-grain Y-type zeolite provided by the invention is main diffraction peak in the small-grain Y-type zeolite XRD spectra provided by the invention accounts for the percentage ratio of same position master's diffraction peak peak area in the small-grain Y-type zeolite XRD spectra that lattice constant that water-content is higher than 10 heavy % is 24.5 dust to 24.7 dusts.The position of main diffraction peak is conventionally known to one of skill in the art in the y-type zeolite XRD spectra.
Preparation method according to small-grain Y-type zeolite provided by the invention, because silicon tetrachloride is a kind of strong absorptive material, and the Yi Yushui reaction generates hydrochloric acid, destroy the structure and the etching apparatus of zeolite, therefore on the one hand, require the water-content in the raw material zeolite low as far as possible, the water-content that also requires on the other hand to contain in the silicon tetrachloride dry gas also should be low as far as possible.
Generally speaking, the water-content in the described raw material zeolite should be not more than 10 heavy %, preferably is not more than 8 heavy %.Yet the water-content in the raw material small-grain Y-type zeolite that existing method is synthesized is all higher, all greater than 10 heavy %, for the water-content that makes the raw material small-grain Y-type zeolite is reduced to below the 10 heavy %, must dewater to small-grain Y-type zeolite.In the prior art, dehydration is all adopted in the method for carrying out roasting more than 400 ℃ to y-type zeolite, this method is suitable for big grain Y-type zeolite, but, the present inventor finds, for small-grain Y-type zeolite, this method can seriously reduce the crystallization reservation degree of small-grain Y-type zeolite, therefore, in the method provided by the invention, described raw material zeolite is that lattice constant is 24.5 dust to 24.7 dusts, the small-grain Y-type zeolite that water-content is lower than 10 heavy % has adopted a kind of preparation method who is different from prior art, this method comprise the lattice constant that water-content is higher than 10 heavy % be the small-grain Y-type zeolite of 24.5 dust to 24.7 dusts at 150-350 ℃, be preferably under 200-300 ℃ the temperature drying at least 0.5 hour, preferred 0.5-10 hour.Wherein, the lattice constant that described water-content is higher than 10 heavy % is that the cation-bit of the small-grain Y-type zeolite of 24.5 dust to 24.7 dusts can be by positively charged ion is occupied arbitrarily, as the fine grain NaY type zeolite that cation-bit is occupied by sodium ion, cation-bit is by the occupied little crystal grain NH of ammonium ion
4Y zeolite, the little crystal grain HY zeolite that cation-bit is occupied by hydrogen ion etc.
The content of water should not be higher than 1000 micrograms water/gram gas in the described dry gas that contains silicon tetrachloride, preferably is not higher than 600 micrograms water/gram gas.Described dry gas refers to not and silicon tetrachloride generation chemical reaction, do not influence in any gas of described small-grain Y-type zeolite character one or more yet, as in dry air, oxygen, nitrogen, carbonic acid gas, the periodic table of elements zero group gas one or more, wherein, preferred dry air or nitrogen.
According to the preparation method of small-grain Y-type zeolite provided by the invention, the described temperature that contacts that contains silicon tetrachloride dry gas and zeolite is 160-300 ℃, is preferably 170-250 ℃, and be 20 minutes to 10 hours duration of contact, is preferably 30 minutes to 5 hours.
The weight ratio of described silicon tetrachloride and zeolite refers to the weight ratio of total consumption of silicon tetrachloride and zeolite, and this weight ratio is 0.1-0.8, is preferably 0.2-0.6.
The purpose of described washing is to remove by products such as the sodium-chlor of small-grain Y-type zeolite and silicon tetrachloride reaction generation, aluminum chloride, described washing can be adopted ordinary method, promptly doubly wash at least once to the deionization of solid product with 5-10, make the sodium oxide content of the little crystal grain overstable gamma zeolite that obtains be lower than 1 heavy %, preferably be lower than 0.5 heavy %.When with the fine grain NaY zeolite during as the raw material y-type zeolite, sometimes only with deionized water wash product deficiency so that sodium oxide content is reduced to below the 1 heavy %, in this case, available ammonium ion exchange method makes the sodium oxide content reduction.Therefore, method provided by the invention can also comprise an ammonium ion exchange process, this ammonium ion exchange process comprises and will contact with a kind of aqueous solution that contains ammonium ion with solid product after silicon tetrachloride contacts that the temperature of contact is 60-90 ℃, is preferably 75-90 ℃, 0.2-2 hour at least duration of contact, be preferably 0.5-1.5 hour, solvent and solute weight ratio is 10-20, is preferably 10-15, the concentration that contains ammonium ion in the aqueous solution of ammonium ion is the 0.3-2 mol, is preferably the 0.5-2 mol.
Small-grain Y-type zeolite provided by the invention can be used as sorbent material and various catalyzer, as catalytic cracking catalyst, and hydrocracking catalyst, the active ingredient of hydrotreating catalyst.
Small-grain Y-type zeolite provided by the invention has higher hydrothermal stability, higher catalytic activity and activity stability.For example, small-grain Y-type zeolite provided by the invention is mixed with pseudo-boehmite and kaolin, make a kind of small-grain Y-type zeolite provided by the invention (crystallization reservation degree is respectively 89% and 87%) 25.0 heavy % that contain after spray-dried, the cracking catalyst of alumina binder 30.0 heavy % and kaolin 45.0 heavy %, catalyzer was worn out 4 hours and 17 hours at 800 ℃ with 100% water vapor respectively, with straight-run diesel oil be raw material to estimate its cracking activity (micro-activity) on the small stationary bed apparatus be 460 ℃ in temperature of reaction, liquid hourly space velocity is 16 hours
-1, the agent weight of oil is than being under 3.2 the condition, through the micro-activity of 800 ℃ of catalyzer of aging 4 hours respectively up to 70 heavy % and 68 heavy %, through the micro-activity of 800 ℃ of catalyzer of aging 17 hours respectively up to 62 heavy % and 57 heavy %.And adopt composition identical, be described small-grain Y-type zeolite be respectively that crystallization reservation degree is when being the catalyzer of 73% and 70% small-grain Y-type zeolite, under same reaction conditions, have only 63 heavy % and 60 heavy % respectively through the micro-activity of 800 ℃ of catalyzer of aging 4 hours, have only 43 heavy % and 39 heavy % respectively through the micro-activity of 800 ℃ of catalyzer of aging 17 hours.
The following examples will the present invention will be further described.
Example 1
This example illustrates small-grain Y-type zeolite provided by the invention and preparation method thereof.
1. raw material fine grain NaY zeolite is synthetic.
According to the method synthesizing small-grain y-type zeolite of embodiment among the CN1081425 1, obtaining average particulate diameter is 0.25 micron, and lattice constant is 24.69 dusts, and sodium oxide content is 13 heavy %, and solid content is the small-grain Y-type zeolite of 80 heavy %.
2. the preparation of small-grain Y-type zeolite provided by the invention.
Take by weighing the 100 grams fine grain NaY zeolite that obtains of the 1st step and place reaction tubes, 300 ℃ of following thermal dehydrations 2 hours, obtaining water-content is the fine grain NaY zeolite of 6 heavy %, be cooled to 250 ℃, feeding contains the dry air 30 minutes of silicon tetrachloride, the water-content that contains the dry air of silicon tetrachloride is 600 micrograms water/gram gas, flow is 25 ml/min, the weight ratio of silicon tetrachloride and fine grain NaY zeolite is 0.2, cooling, solid product is drawn off, with 12 times of deionized water wash solid products, 110 ℃ of oven dry to solid product.Be to be that the ammoniumsulphate soln of 1.6 mol carried out ion-exchange 30 minutes with concentration under 11 the condition at 90 ℃ temperature, solvent and solute weight ratio, filter, to the sulfate radical-free ion, 110 ℃ of oven dry obtain small-grain Y-type zeolite GM-1 provided by the invention with the deionized water wash solid product.The lattice constant of GM-1, crystallization reservation degree, sodium oxide content and average particulate diameter are listed in the table 1.
Wherein, lattice constant is measured with x-ray diffraction method, and crystallization reservation degree is also measured with x-ray diffraction method, is benchmark with the peak area of the main diffraction peak of y-type zeolite 2 θ=about 23.60 °.
Sodium oxide content adopts aas determination.The average particulate diameter of zeolite adopts transmission electron microscope method to measure.
Example 2
This example illustrates small-grain Y-type zeolite provided by the invention and preparation method thereof.
1. the raw material small-grain Y-type zeolite is synthetic.
According to the method synthesizing small-grain NaY zeolite of example among the CN1079444A 8, obtaining average particulate diameter is 0.12 micron, and lattice constant is 24.67 dusts, and sodium oxide content is 14.5 heavy %, and solid content is the NaY zeolite of 75 heavy %.
2. the preparation of small-grain Y-type zeolite provided by the invention.
Taking by weighing the 100 gram the first steps obtains the fine grain NaY zeolite and places reaction tubes, 300 ℃ of following thermal dehydrations 2 hours, getting water-content is the fine grain NaY zeolite of 6 heavy %, be cooled to 250 ℃, feed the dry air 30 minutes contain silicon tetrachloride, the water-content that contains the dry air of silicon tetrachloride is 600 micrograms water/gram gas, flow is 25 ml/min, the weight ratio of silicon tetrachloride and fine grain NaY zeolite is 0.2, and cooling draws off solid product.By the 2nd step described method washing in the example 1 and carry out the ammonium exchange, 110 ℃ of oven dry obtain small-grain Y-type zeolite GM-2 provided by the invention.The lattice constant of GM-2, crystallization reservation degree, sodium oxide content and average particulate diameter are listed in the table 1.
Example 3
This example illustrates small-grain Y-type zeolite provided by the invention and preparation thereof.
Method by the 2nd step in the example 2 prepares small-grain Y-type zeolite provided by the invention with the fine grain NaY zeolite that the 1st step synthesized in the example 2, different is that described dehydration temperaturre is 250 ℃, dewatering time 8 hours, the water-content of dehydration back fine grain NaY zeolite is 4 heavy %, the water-content that contains the silicon tetrachloride dry air is 350 micrograms/gram gas, containing the temperature that the silicon tetrachloride dry air contacts with the fine grain NaY zeolite is 220 ℃, be 2 hours duration of contact, the weight ratio of silicon tetrachloride and fine grain NaY zeolite is 0.4, obtains small-grain Y-type zeolite GM-3 provided by the invention.The lattice constant of GM-3, crystallization reservation degree, sodium oxide content and average particulate diameter are listed in the table 1.
Example 4
This example illustrates small-grain Y-type zeolite provided by the invention and preparation method thereof.
Prepare small-grain Y-type zeolite provided by the invention by described method of the 2nd step in the example 2 with the fine grain NaY zeolite that the 1st step was synthesized in the example 2, different is that described dehydration temperaturre is 250 ℃, dewatering time is 3 hours, the water-content of dehydration back fine grain NaY zeolite is 8 heavy %, the water-content that contains the silicon tetrachloride dry air is 800 micrograms water/gram gas, containing the temperature that the silicon tetrachloride air contacts with the fine grain NaY zeolite is 220 ℃, be 2 hours duration of contact, the weight ratio of silicon tetrachloride and fine grain NaY zeolite is 0.24, obtains small-grain Y-type zeolite GM-4 provided by the invention.The lattice constant of GM-4, crystallization reservation degree, sodium oxide content and average particulate diameter are listed in the table 1.
Comparative Examples 1-2
This Comparative Examples explanation reference small-grain Y-type zeolite and preparation thereof.
Use the Hydrothermal Preparation small-grain Y-type zeolite.Take by weighing the fine grain NaY zeolite that the 1st step was synthesized in 30 gram (dry basis) examples 2, condition when exchanging by ammonium in the example 2 and each material consumption carry out the ammonium exchange, filter and washing, with the wet cake that obtains at 550 ℃, roasting is 2 hours under 100% water vapor, obtains reference small-grain Y-type zeolite BM-1.BM-1 is carried out the ammonium exchange second time by same condition, and roasting under same condition, reference small-grain Y-type zeolite BM-2 obtained.Table 1 has been listed lattice constant, crystallization reservation degree, sodium oxide content and the average particulate diameter of BM-1 and BM-2.
Comparative Examples 3
This Comparative Examples explanation reference small-grain Y-type zeolite and preparation thereof.
Take by weighing the fine grain NaY zeolite that the 1st step was synthesized in 30 gram (dry basis) examples 2, condition and each material consumption of pressing when ammonium exchanges in the example 2 mix the fine grain NaY zeolite with ammoniumsulphate soln, dripping concentration under 60 ℃ temperature is the ammonium fluosilicate solution of 0.2 mol, drip 80 milliliters of described ammonium fluosilicate solutions in 2 hours, filter, to there not being acid ion, 110 ℃ of oven dry obtain reference small-grain Y-type zeolite BM-3 with the deionized water wash solid product.The lattice constant of BM-3, crystallization reservation degree and sodium oxide content are listed in the table 1.
Comparative Examples 4
This Comparative Examples explanation reference small-grain Y-type zeolite and preparation method thereof.
Method by the 2nd step in the example 2 prepares small-grain Y-type zeolite with the fine grain NaY zeolite that the 1st step was synthesized in the example 2, different just dehydration temperaturres are 400 ℃, dewatering time is 2 hours, and water-content is 4 heavy % in the fine grain NaY zeolite of dehydration back, gets reference small-grain Y-type zeolite BM-4.The lattice constant of BM-4, crystallization reservation degree, sodium oxide content and average particulate diameter are listed in the table 1.
Table 1
| Example number | The zeolite numbering | Lattice constant, dust | Crystallization reservation degree, % | Sodium oxide content, heavy % | Average particulate diameter, micron |
| 1 | GM-1 | 24.46 | 89 | 0.56 | 0.26 |
| 2 | GM-2 | 24.44 | 90 | 0.45 | 0.15 |
| 3 | GM-3 | 24.47 | 92 | 0.42 | 0.14 |
| 4 | GM-4 | 24.45 | 87 | 0.30 | 0.15 |
| Comparative Examples 1 | BM-1 | 24.63 | 80 | 5.6 | 0.13 |
| Comparative Examples 2 | BM-2 | 24.45 | 73 | 0.32 | 0.15 |
| Comparative Examples 3 | BM-3 | 24.47 | 70 | 0.55 | 0.14 |
| Comparative Examples 4 | BM-4 | 24.44 | 71 | 0.43 | 0.15 |
Example 5-8
The following examples illustrate the catalytic performance and the hydrothermal stability of small-grain Y-type zeolite provided by the invention.
(name of product is for intending thin water aluminium dry glue powder with pseudo-boehmite respectively for the small-grain Y-type zeolite GM-1 to GM-4 that example 1 to example 4 is prepared, Shandong Aluminum Plant produces) and kaolin (technical grade, Suzhou kaolin company produces) mix by 25.0: 30.0: 45.0 butt weight ratios, add deionized water, mix, slurry solid content is 25 heavy %, and spray drying forming under 200 ℃ temperature obtains containing the cracking catalyst C that small-grain Y-type zeolite 25 provided by the invention weighs % then
1-C
4, catalyzer C
1-C
4Composition list in the table 2.Wherein each components contents is got by calculating.
With the catalyzer C that obtains
1-C
4Respectively 800 ℃ with 100% water vapor hydrothermal aging 4 hours and 17 hours, obtain the catalyzer C of hydrothermal aging 4 hours and 17 hours
1-C
4With straight-run diesel oil is raw material (character of straight-run diesel oil is as shown in table 3), estimates the catalyzer C of hydrothermal aging 4 hours and 17 hours on the small stationary bed apparatus
1-C
4Cracking activity, temperature of reaction is 460 ℃, liquid hourly space velocity is 16 hours
-1, agent weight of oil ratio is 3.2, reaction result is listed in the table 4.
Wherein,
W in the formula
1Be the weight that liquid is received oil, X
1Be that gasoline fraction accounts for the weight percentage that liquid is received oil, W is the weight of feed oil.
Comparative Examples 5-8
The catalytic performance and the hydrothermal stability of following Comparative Examples explanation reference small-grain Y-type zeolite.
Method by example 6 prepares catalyzer, and the different reference small-grain Y-type zeolite BM-1 to BM-4 that just prepare with Comparative Examples 1-4 respectively replace small-grain Y-type zeolite GM-2 provided by the invention, obtain containing the catalyst B of reference small-grain Y-type zeolite
1-B
4, press the aging B of method of example 6
1-B
4, and estimate aging back B
1-B
4Cracking activity, the results are shown in Table 4.
Table 2
| Example number | The catalyzer numbering | Used zeolite | Catalyzer is formed, heavy % | ||
| Zeolite | Aluminum oxide | Kaolin | |||
| 5 | C 1 | GM-1 | 25.0 | 30.0 | 45.0 |
| 6 | C 2 | GM-2 | 25.0 | 30.0 | 45.0 |
| 7 | C 3 | GM-3 | 25.0 | 30.0 | 45.0 |
| 8 | C 4 | GM-4 | 25.0 | 30.0 | 45.0 |
| Comparative Examples 5 | B 1 | BM-1 | 25.0 | 30.0 | 45.0 |
| Comparative Examples 6 | B 2 | BM-2 | 25.0 | 30.0 | 45.0 |
| Comparative Examples 7 | B 3 | BM-3 | 25.0 | 30.0 | 45.0 |
| Comparative Examples 8 | B 4 | BM-4 | 25.0 | 30.0 | 45.0 |
Table 3
| Title | Straight-run diesel oil |
| Density, gram per centimeter 3 | 0.8419 |
| Nitrogen content, ppm | 84 |
| Sulphur content, ppm | 603 |
| Initial boiling point, ℃ | 235 |
| Do, ℃ | 337 |
Table 4
| Example number | The catalyzer numbering | Micro-activity | |
| 800 ℃ were worn out 4 hours | 800 ℃ were worn out 17 hours | ||
| 5 | C 1 | 70.0 | 62.8 |
| 6 | C 2 | 70.8 | 63.2 |
| 7 | C 3 | 72.0 | 63.5 |
| 8 | C 4 | 68.2 | 57.3 |
| Comparative Examples 5 | B 1 | 66.0 | 35.4 |
| Comparative Examples 6 | B 2 | 63.2 | 43.6 |
| Comparative Examples 7 | B 3 | 60.5 | 39.2 |
| Comparative Examples 8 | B 4 | 62.0 | 41.0 |
Result from table 2 to table 4 as can be seen, identical at zeolite content, under the identical situation of appreciation condition, all be much higher than the identical catalyzer that contains the reference small-grain Y-type zeolite of hydrothermal aging condition with the micro-activity of 17 hours the catalyzer that contains small-grain Y-type zeolite provided by the invention through hydrothermal aging 4 hours.This illustrates that on the one hand small-grain Y-type zeolite provided by the invention has higher cracking activity and activity stability, illustrates also that on the other hand small-grain Y-type zeolite provided by the invention has higher hydrothermal stability.
Claims (11)
1. a small-grain Y-type zeolite is characterized in that, the lattice constant of this zeolite is the 24.25-24.5 dust, and crystallization reservation degree is at least 75%, and the average particulate diameter of described zeolite is the 0.1-0.5 micron.
2. zeolite according to claim 1 is characterized in that, the lattice constant of described zeolite is the 24.3-24.5 dust, and the crystallization reservation degree of described zeolite is 80-95%.
3. the preparation method of the described small-grain Y-type zeolite of claim 1, this method comprises that the dry gas that will contain silicon tetrachloride contacts with a kind of raw material y-type zeolite, the product that washing obtains, it is characterized in that, described raw material y-type zeolite is that a kind of lattice constant is the small-grain Y-type zeolite that 24.5 dust to 24.7 dust water-contents are not more than 10 heavy %, water-content in the described dry gas that contains silicon tetrachloride is not higher than 1000 micrograms water/gram gas, the contact temperature is 160-300 ℃, be 20 minutes to 10 hours duration of contact, the weight ratio of silicon tetrachloride and zeolite is 0.1-0.8, described lattice constant is that preparation method that 24.5 dust to 24.7 dust water-contents are not more than the small-grain Y-type zeolite of 10 heavy % comprises that the lattice constant that water-content is higher than 10 heavy % is the small-grain Y-type zeolite of 24.5 dust to 24.7 a dusts drying at least 0.5 hour under 150-350 ℃ temperature, described dry gas refers to not and silicon tetrachloride generation chemical reaction, also do not influence in any gas of described small-grain Y-type zeolite character one or more.
4. method according to claim 3 is characterized in that, the water-content of described raw material y-type zeolite is not more than 8 heavy %.
5. method according to claim 3, it is characterized in that described lattice constant is that preparation method that 24.5 dust to 24.7 dust water-contents are not more than the small-grain Y-type zeolite of 10 heavy % comprises that the lattice constant that water-content is higher than 10 heavy % is the small-grain Y-type zeolite of 24.5 dust to 24.7 dusts under 200-300 ℃ temperature dry 0.5-10 hour.
6. method according to claim 3 is characterized in that, water-content is not higher than 600 micrograms water/gram gas in the described dry gas that contains silicon tetrachloride.
7. according to claim 3 or 6 described methods, it is characterized in that described dry gas refers to dry air or nitrogen.
8. method according to claim 3 is characterized in that, the described dry gas that contains silicon tetrachloride is 170-250 ℃ with the temperature that contacts of zeolite, and be 30 minutes to 5 hours duration of contact.
9. method according to claim 3 is characterized in that, the weight ratio of described silicon tetrachloride and zeolite is 0.2-0.6.
10. method according to claim 3, it is characterized in that, this method also comprises an ammonium ion exchange process, described ammonium ion exchange process comprises and will contact with a kind of aqueous solution that contains ammonium ion with solid product after silicon tetrachloride contacts, the temperature of contact is 60-90 ℃, be 0.2-2 hour duration of contact, and solvent and solute weight ratio is 10-20, and the concentration that contains ammonium ion in the aqueous solution of ammonium ion is the 0.3-2 mol.
11. method according to claim 10 is characterized in that, described contact temperature is 75-90 ℃, and be 0.5-1.5 hour duration of contact, and solvent and solute weight ratio is 10-15, and the concentration that contains ammonium ion in the ammonium ion aqueous solution is the 0.5-2 mol.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB011156228A CN1171790C (en) | 2001-04-28 | 2001-04-28 | Small-grain Y-type zeolite and its preparing process |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB011156228A CN1171790C (en) | 2001-04-28 | 2001-04-28 | Small-grain Y-type zeolite and its preparing process |
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| Publication Number | Publication Date |
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| CN1382632A CN1382632A (en) | 2002-12-04 |
| CN1171790C true CN1171790C (en) | 2004-10-20 |
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| CN102320621B (en) * | 2011-08-20 | 2013-08-28 | 广东科艺普实验室设备研制有限公司 | Hydrophobic modification method for Y-shaped molecular sieve |
| CN104588124B (en) * | 2013-11-03 | 2017-01-25 | 中国石油化工股份有限公司 | Preparation method of hydrocracking catalyst carrier |
| CN104841495B (en) * | 2015-04-15 | 2017-03-15 | 中国石油大学(华东) | With SiCl4Reaction ammonium exchanges the rejuvenation method of catalytic cracking spent catalyst |
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| CN1382632A (en) | 2002-12-04 |
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